A:200 mL 2 mol•L﹣1 MgCl2溶液
B:1000 mL 2.5 mol•L﹣1 NaCl溶液
C:250 mL 1 mol•L﹣1 AlCl3溶液
D:300 mL 5 mol•L﹣1 KClO3溶液
I like to eat apples, __________ I don't often eat them.
下列可以称为生态系统的是( )